21221389

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{151}}^1\times {\mathrm{1181}}^1$

素因数の和:1356

約数の個数: 16

約数和(自身を含む): 25871616

約数和(自身を除く): 4650227

約数列:

[1, 7, 17, 119, 151, 1057, 1181, 2567, 8267, 17969, 20077, 140539, 178331, 1248317, 3031627, 21221389]

約数ペア:

[(1, 21221389), (7, 3031627), (17, 1248317), (119, 178331), (151, 140539), (1057, 20077), (1181, 17969), (2567, 8267)]